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A (38) B (45) C (35) D (64) E (53) F (14) G (42) H (78) I (3) J (22) K (29) L (47) M (29) N (18) O (4) P (89) Q (1) R (37) S (40) T (16) U (1) V (8) W (64) Y (1) Z (1)
Raleigh, [Sir] Walter Alexander (1861-1922)
In an examination those who do not wish to know ask questions of those who cannot tell.
Some Thoughts on Examinations.
Recorde, Robert (1557)
To avoide the tediouse repetition of these woordes: is equalle to: I will settle as I doe often in woorke use, a paire of paralleles, or gemowe [twin] lines of one lengthe: =, bicause noe .2. thynges, can be moare equalle.
In G. Simmons, Calculus Gems, New York: McGraw Hill Inc., 1992.
Reid, Thomas
It is the invaluable merit of the great Basel mathematician Leonard Euler, to have freed the analytical calculus from all geometric bounds, and thus to have established analysis as an independent science, which from his time on has maintained an unchallenged leadership in the field of mathematics.
In N. Rose, Mathematical Maxims and Minims, Raleigh NC: Rome Press Inc., 1988.
Renan, Ernest
The simplest schoolboy is now familiar with facts for which Archimedes would have sacrificed his life.
Souvenirs d'enfance et de jeunesse.
Renyi, Alfred
If I feel unhappy, I do mathematics to become happy. If I am happy, I do mathematics to keep happy.
P. Turan, "The Work of Alfred Renyi", Matematikai Lapok 21, 1970, pp 199 - 210.
Richardson, Lewis Fry (1881 - 1953)
Another advantage of a mathematical statement is that it is so definite that it might be definitely wrong; and if it is found to be wrong, there is a plenteous choice of amendments ready in the mathematicians' stock of formulae. Some verbal statements have not this merit; they are so vague that they could hardly be wrong, and are correspondingly useless.
Mathematics of War and Foreign Politics.
Riskin, Adrian
(after Edna St. Vincent Millay)
...Euclid alone
Has looked on Beauty bare.
He turned away at once;
Far too polite to stare.
The Mathematical Intelligencer, V. 16, no. 4 (Fall 1994), p. 20.
R. Rivest, A. Shamir
The magic words are squeamish ossifrage.

[This sentence is the result when a coded message in Martin Gardner's column about factoring the famous number RSA-129 is decoded.]
See the article whose title is the above quotation by Barry Cipra, SIAM News, July 1994, 1, 12-13.
Rohault, Jacques (17th century)
It was by just such a hazard, as if a man should let fall a handful of sand upon a table and the particles of it should be so ranged that we could read distinctly on it a whole page of Virgil's Aenead.
Traite de Physique, Paris, 1671.
Rosenblueth, A
[with Norbert Wiener]
The best material model of a cat is another, or preferably the same, cat.
Philosophy of Science 1945.